Jane is walking along a beach and finds seaweed washed up on the beach. It resembles a plant with a long stem-like structure with what appears to be leaves attached to it. . She observes a ball-like structure attached to the stem. What is this structure and what has Jane presumably found? The ball-like structure Jane observes is a , and she presumably has found a species of .

The diagram below shows the layers of a rock having a trilobite: a rock column labeled rock is shown. the column has three layers. the bottommost layer of the rock has one shaded rhomboid shape, the middle layer has a rhombus with a diagonal along with two identical organisms marked as, trilobite, in the key, the top layer has two semicircles. a key is shown on the right side of the diagram. the shaded rhombus is marked as a, the rhombus with the diagonal is marked as b, the semicircle is marked as c which statement about the rock fossils is true?